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Title: Proving Coriolis Meters
Author: J. W. Sulton
Source: 2006 International School of Hydrocarbon Measurement
Year Published: 2006
Abstract: Coriolis meters are in use throughout the hydrocarbon industry for the measurement of fluids including crude oil, products such as fuel oil, gasoline, and diesel, and light hydrocarbons such as natural gas liquids, propane, etc. When used for custody transfer, it is most often required by contract between the buyer and seller that the meter be proven in the field on the fluid that is being measured and at the conditions under which it will be operating. This paper will utilize the American Petroleum Institutes Manual of Petroleum Measurement Standards (MPMS) as the reference for industry practices for field proving methods and calculations. Coriolis meters can measure volume, mass and density. If the meter is used to measure volume and the pulse output represents volume, the meter should be proven as a volume meter. MPMS Chapter 4, Proving Systems, contains information specific to volumetric proving. If the meter is used to measure mass and the pulse output represents mass, the meter should be proven as a mass meter. Currently Chapter 4 does not contain information relative to proving on a mass basis however MPMS Chapter 5.6, Measurement of Liquid Hydrocarbons by Coriolis Meter, does provide guidelines for mass proving. If the density output is used for custody transfer flow calculations, the density measurement can be proven using MPMS Chapter 14.6, Continuous Density Measurement if a pycnometer is used or MPMS Chapter 9, Density Determination if a hydrometer is used. MPMS Chapter 12 Calculation of Petroleum Quantities addresses the calculation of a meter factor and the application of the factor to the flow calculation. The temperature output of a Coriolis meter if obtained from the internal RTD mounted on the sensor tube, is not recommended for use in custody transfer measurement as it is not intended to measure the fluid temperature but the temperature of the tube itself.

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